In Global Navigation Satellite System (GNSS) like Global Positioning
System (GPS) and future Galileo, space signal reception in urban environment
seems to be one of most significant. The urban environment is characterized by
the presence of an excessive number of obstacles that produce Multiple Path
(MP) in positioning the receiver. Consequently, it is of primary importance to
characterize and ameliorate the performances of GNSS receiver for this type of
application. In this paper, a method to mitigate MP in GNSS applications was
proposed. Its principle is based on the addition, to the geographic map of a
city or a neighborhood,of a
supplementary information that consists of the correction of error caused by
the MPs. The latter one was carried out by the comparison of the measurements,
realized by Differential GPS (DGPS) and GPS, between two different sites with
the same form. The first onewas characterized
by the presence of the MPs and the second one was completely clear of any type
of obstacle. As a consequence, the measurements comparison has allowed usto deduce the GNSS MPs
errors. This information can subsequently be used to make the corrections of
the errors caused by MPs and it can be generalized by a measurement company to
any entire city in order to identify errors in any neighborhood.
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